Just had to get a couple of these from my LBS, to do the same thing. Asked the kid that waited on me, and he pointed to a threadless headset spacer and said "Like these?". I told him no, this is for a 1" threaded headset. He looked perplexed but went into the back room and emerged with a couple. Surprised me. I had asked him if they had a junk parts drawer or something similar as I would have been happy to dig around for them, but it appears they don't.